Defensive



W DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Apr.11, 1968, 849 0.G. 1221. Identification is by serial number of theapplication and the heading indicates the number of pages ofspecification, including claims, and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor 30 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Oflicemakes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 8, 1969 763 397 PHOTOSENSITIVE COMi'OSITION CONTAININGHEAT-HARDENABLE POLYMERS Georges A. Phlipot and Simone J. Kempen,Vincennes, France Filed Sept. 27, 1968. Published Apr. 8, 1969 Class96-28 No Drawing. 25 Pages Specification A photosensitive com-positionis described which comprises an amine-formaldehyde polymer such as aureaformaldehyde resin or a melamine-formaldehyde resin, aphotooxidizable organic sulfur compound such as a thinamide, a thiourea,a thiosemicarbazide, a dithiooxamide or a thiuram sulfide in anoxygen-permeable binder. Optionally, the photosensitive composition cancontain a sensitizer such as a photosensitizing dye. The photosensitivecomposition is used to prepare photographic images by exposing toactinic radiation an element containing a layer of the photosensitivecomposition to harden the composition in photo-exposed areas, furtherhardening the composition in exposed areas by heating the element anddeveloping an image by removing the unexposed, unhardened compositionfrom the element.

